PROGRESS OF RESEARCH ON GOLD “SOURCE BED/ROCK”

The research on the "source bed/rock" for gold deposits has experienced three periods, that is, the period of hypothesis and inference, the period of geochemical distinction and the period of study on the occurrence (or releasability) of gold.The newest result shows that the gold in strata or rocks is in two parts.One of them occurs inside the lattice of silicate or oxide facies, which is difficult to be released in gold mineralization, with less contribution to metallogenesis.The other occurs mainly between the grains of sulfides or rock-forming minerals and within organic or carbonate grains, which is easy to be released, transferred by ore-forming fluids, and enriched in favorable position for depositing in the later stage of mineralization.